HTML5 breakpoint resume upload sample code sharing-H5 Tutorial-php.cn

Home

Web Front-end

H5 Tutorial

HTML5 breakpoint resume upload sample code sharing

黄舟

Mar 25, 2017 pm 04:07 PM

BreakpointUpload, which is more reliable in java. Generally, Flex is used. I admit that I have just touched upon it and am not proficient in it. HTML 5 has a Blob object (the File object inherits it), and this object has a method slice method. A file can be fragmented. In addition, the File API and WebStorage of HTML 5 have been used.

The code is relatively complicated. After dividing a file into small pieces, Each upload will put the uploaded bytes into LocalStorage. For how to clear the cache in LocalStorage, please refer to Chrome - HTML 5 Local Storage. If the upload is paused or the browser is closed next time, The upload will start from that node.

PS: For demo operation, please establish the WS connection first, and then select file upload

Please accept the code:

<!DOCTYPE html>
<html>
<head>
    <title>使用WebSocket实现断点续传文件</title>
    <meta charset="utf-8">
</head>
<script type="text/javascript" src="demo.js"></script>
 
<body onload="init();">
<button onclick="webSocketConn();">创建连接</button>(step1)
<div class="row">
      <label for="fileToUpload">Select a File to Upload</label>
      <input type="file" name="fileToUpload" id="fileToUpload" onchange="fileSelected();"/>(step2)
</div>
<div id="fileName"></div>
<div id="fileSize"></div>
<div id="fileType"></div>
<div class="row">
    <button onclick="sendFileName();uploadFile()">上传</button>(step3)
    <button onclick="pauseUpload()">暂停</button>
     <label id="progressNumber"></label>
</div>
<div id="msg" style="max-height: 400px; overflow:auto;min-height: 100px;">
</div>
</body>
</html>

#######  断点续传  ######
author：linrb
createTime: 2012-08-22
QQ: 569830404
*/
var websocket = null;  //websocket
var msg = null; //日志
var paragraph = 10240;  //每次分片传输文件的大小 10KB
var blob = null;//  分片数据的载体Blob对象
var file = null; //传输的文件
var startSize,endSize = 0; //分片的始终字节点
var uploadState = 0;  // 0: 无上传/取消， 1： 上传中， 2： 暂停
 
//初始化消息框
function init(){
    msg = document.getElementById("msg");
}
/**
 * 分片上传文件
 */
function uploadFile() {
    if(file){
        //将上传状态设置成1
        uploadState = 1;
        endSize = getLastestUploadEndSize(file);
        var reader = new FileReader();
        reader.onload = function loaded(evt) {
            var ArrayBuffer = evt.target.result;
            websocket.send(ArrayBuffer);
            uploadProgress(endSize);
        };
        if(endSize < file.size){
            //先发送文件名称
            //websocket.send(file.name);
            //处理文件发送（字节）
            startSize = endSize;
            if(paragraph > (file.size - endSize)){
                endSize = file.size;
            }else{
                endSize += paragraph ;
            }
            if (file.webkitSlice) {
              //webkit浏览器
                blob = file.webkitSlice(startSize, endSize);
            }else
                blob = file.slice(startSize, endSize);
            reader.readAsArrayBuffer(blob);
        }
    }
}
 
//显示处理进程
function uploadProgress(uploadLen) {
    var percentComplete = Math.round(uploadLen * 100 / file.size);
    document.getElementById(&#39;progressNumber&#39;).innerHTML = percentComplete.toString() + &#39;%&#39;;
 
    //保存到LocalStorage一边下次传输，可以记忆起这个断点
    localStorage.setItem(file.lastModifiedDate + "_" + file.name, uploadLen);
     
}
 
//WebSocket连接
function webSocketConn(){
    try{
        var readyState = new Array("正在连接", "已建立连接", "正在关闭连接"
                    , "已关闭连接");
        var host = "ws://localhost:8000";
        websocket = new WebSocket(host);
        websocket.onopen = function(){
            msg.innerHTML += "<p>Socket状态： " + readyState[websocket.readyState] + "</p>";
        };
        websocket.onmessage = function(event){
            //每上传一个分片之后，等待介绍了服务端的提示之后再做下一个分片上传
            if(event.data.indexOf("ok") != -1 && uploadState == 1){
                if(endSize == file.size){
                    localStorage.removeItem(file.lastModifiedDate + "_" + file.name);
                    msg.innerHTML += "<p>上传完成!!</p>";
                    websocket.close();//结束上传
                }else{
                    uploadFile();
                }
            }
        };
        websocket.onclose = function(){
            msg.innerHTML += "<p>Socket状态： " + readyState[websocket.readyState] + "</p>";
        };
        msg.innerHTML += "<p>Socket状态： " + readyState[websocket.readyState] + "</p>";
    }catch(exception){
        msg.innerHTML += "<p>有错误发生</p>";
        return;
    }
}
 
/*
暂停上传
*/
function pauseUpload(){
    uploadState = 2;
}
 
/**
 * 从localStorage检查最后一次上传的字节
 */
function getLastestUploadEndSize(uploadFile){
    var lastestLen = localStorage.getItem(uploadFile.lastModifiedDate + "_" + uploadFile.name);
    if(lastestLen){
        return parseInt(lastestLen);
    }else{
        return 0;
    }
}
 
 
/*
    发送文件名
*/
function sendFileName(){
    websocket.send(file.name);
}
/**
 * 选择文件之后触发事件
 */
function fileSelected() {
  file = document.getElementById(&#39;fileToUpload&#39;).files[0];
  if (file) {
    var fileSize = 0;
    if (file.size > 1024 * 1024)
      fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + &#39;MB&#39;;
    else
      fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + &#39;KB&#39;;
 
    document.getElementById(&#39;fileName&#39;).innerHTML = &#39;Name: &#39; + file.name;
    document.getElementById(&#39;fileSize&#39;).innerHTML = &#39;Size: &#39; + fileSize;
    document.getElementById(&#39;fileType&#39;).innerHTML = &#39;Type: &#39; + file.type;
  }
}

Server:

package fileUpload;
 
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.security.MessageDigest;
 
 
 
public class UploadServer {
    private int port = 8000;
    private ServerSocket serverSocket;
 
    public UploadServer() throws IOException {
        serverSocket = new ServerSocket(port);
        System.out.println("服务器启动");
    }
 
    private void service() {
        Socket socket = null;
        while (true) {
            try {
                socket = serverSocket.accept();
                Thread workThread = new Thread(new Handler(socket));
                workThread.start();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
 
    class Handler implements Runnable {
        private Socket socket;
        private boolean hasHandshake = false;
        Charset charset = Charset.forName("UTF-8");  
        private File file = null;
        private FileOutputStream fileOut = null;
         
        public Handler(Socket socket) {
            this.socket = socket;
        }
 
        private PrintWriter getWriter(Socket socket) throws IOException {
            OutputStream socketOut = socket.getOutputStream();
            return new PrintWriter(socketOut, true);
        }
 
 
        public String echo(String msg) {
            return "echo:" + msg;
        }
 
        public void run() {
             
            try {
                System.out.println("New connection accepted"
                        + socket.getInetAddress() + ":" + socket.getPort());
                InputStream in = socket.getInputStream();
                 
                PrintWriter pw = getWriter(socket);
                //读入缓存
                byte[] buf = new byte[1024];
                //读到字节
                int len = in.read(buf, 0, 1024);
                //读到字节数组
                byte[] res = new byte[len];
                System.arraycopy(buf, 0, res, 0, len);
                String key = new String(res);
                if(!hasHandshake && key.indexOf("Key") > 0){
                    key = key.substring(0, key.indexOf("==") + 2);
                    key = key.substring(key.indexOf("Key") + 4, key.length()).trim();
                    key+= "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
                    MessageDigest md = MessageDigest.getInstance("SHA-1");  
                    md.update(key.getBytes("utf-8"), 0, key.length());
                    byte[] sha1Hash = md.digest();  
                        sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();  
                    key = encoder.encode(sha1Hash);  
                    pw.println("HTTP/1.1 101 Switching Protocols");
                    pw.println("Upgrade: websocket");
                    pw.println("Connection: Upgrade");
                    pw.println("Sec-WebSocket-Accept: " + key);
                    pw.println();
                    pw.flush();
                    hasHandshake = true;
                     
                    //接收数据
                    byte[] first = new byte[1];
                        int read = in.read(first, 0, 1);
                        while(read > 0){
                            int b = first[0] & 0xFF;
                            //boolean fin = (b & 0x80) > 0;
                           // int rsv = (b & 0x70) >>> 4;
                            byte opCode = (byte) (b & 0x0F);
                             
                            if(opCode == 8){
                            socket.getOutputStream().close();
                            file = null;
                            fileOut.flush();
                            fileOut.close();
                            fileOut = null;
                            break;
                            }
                            b = in.read();
                            int payloadLength = b & 0x7F;
                            if (payloadLength == 126) {
                                byte[] extended = new byte[2];
                                in.read(extended, 0, 2);
                                int shift = 0;
                                payloadLength = 0;
                            for (int i = extended.length - 1; i >= 0; i--) {
                                payloadLength = payloadLength + ((extended[i] & 0xFF) << shift);
                                shift += 8;
                            }
 
                        } else if (payloadLength == 127) {
                            byte[] extended = new byte[8];
                            in.read(extended, 0, 8);
                            int shift = 0;
                            payloadLength = 0;
                            for (int i = extended.length - 1; i >= 0; i--) {
                                payloadLength = payloadLength + ((extended[i] & 0xFF) << shift);
                                shift += 8;
                            }
                        }
                         
                        //掩码
                        byte[] mask = new byte[4];
                        in.read(mask, 0, 4);
                        int readThisFragment = 1;
                        ByteBuffer byteBuf = ByteBuffer.allocate(payloadLength);
                        while(payloadLength > 0){
                             int masked = in.read();
                             masked = masked ^ (mask[(int) ((readThisFragment - 1) % 4)] & 0xFF);
                             byteBuf.put((byte) masked);
                             payloadLength--;
                             readThisFragment++;
                        }
                        byteBuf.flip();
                        if(opCode == 1){
                            getChar(byteBuf.array());
                        }else
                            outFile(byteBuf.array());
                        in.read(first, 0, 1);
                    }
                     
                }
                in.close();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    if (socket != null)
                        socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
         
        private void responseClient(boolean finalFragment) throws IOException {
            ByteBuffer byteBuf = ByteBuffer.allocate(10);
            byteBuf.put("ok".getBytes("UTF-8"));
            OutputStream out = socket.getOutputStream();
            int first = 0x00;
            //是否是输出最后的WebSocket响应片段，默认
            if (finalFragment) {
                first = first + 0x80;
                first = first + 0x1;
            }
            out.write(first);
             
 
            if (byteBuf.limit() < 126) {
                out.write(byteBuf.limit());
            } else if (byteBuf.limit() < 65536) {
                out.write(126);
                out.write(byteBuf.limit() >>> 8);
                out.write(byteBuf.limit() & 0xFF);
            } else {
                // Will never be more than 2^31-1
                out.write(127);
                out.write(0);
                out.write(0);
                out.write(0);
                out.write(0);
                out.write(byteBuf.limit() >>> 24);
                out.write(byteBuf.limit() >>> 16);
                out.write(byteBuf.limit() >>> 8);
                out.write(byteBuf.limit() & 0xFF);
 
            }
 
            // Write the content
            out.write(byteBuf.array(), 0, byteBuf.limit());
            out.flush();
        }
         
        /**
         * 方法说明:
         * @开发：linrb
         * @创建时间：2012-8-21
         * @param array
         * @throws IOException 
         */
        private void getChar(byte[] array) throws IOException {
            ByteArrayInputStream  byteIn = new ByteArrayInputStream(array);
            InputStreamReader reader = new InputStreamReader(byteIn, charset.newDecoder());
            int b = 0;
            String res = "";
            try {
                while((b = reader.read()) > 0){
                    res += (char)b;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            file = new File("C:/" + res);
        }
 
        /**
         * 方法说明:
         * @开发：linrb
         * @创建时间：2012-8-14
         * @param array
         * @throws IOException 
         */
        private void outFile(byte[] array) throws IOException {
            if(fileOut == null){
                fileOut = new FileOutputStream(file, true);
            }
            fileOut.write(array);
            responseClient(true);
        }
    }
 
    public static void main(String[] args) throws IOException {
        new UploadServer().service();
    }
}

The above is the detailed content of HTML5 breakpoint resume upload sample code sharing. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

html5的div一行可以放两个吗Apr 25, 2022 pm 05:32 PM

html5的div元素默认一行不可以放两个。div是一个块级元素，一个元素会独占一行，两个div默认无法在同一行显示；但可以通过给div元素添加“display：inline;”样式，将其转为行内元素，就可以实现多个div在同一行显示了。

html5中列表和表格的区别是什么Apr 28, 2022 pm 01:58 PM

html5中列表和表格的区别：1、表格主要是用于显示数据的，而列表主要是用于给数据进行布局；2、表格是使用table标签配合tr、td、th等标签进行定义的，列表是利用li标签配合ol、ul等标签进行定义的。

html5怎么让头和尾固定不动Apr 25, 2022 pm 02:30 PM

固定方法：1、使用header标签定义文档头部内容，并添加“position:fixed;top:0;”样式让其固定不动；2、使用footer标签定义尾部内容，并添加“position: fixed;bottom: 0;”样式让其固定不动。

HTML5中画布标签是什么May 18, 2022 pm 04:55 PM

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制，它只是一个矩形的图形容器，绘制图形必须通过脚本（通常是JavaScript）来完成；开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5中不支持的标签有哪些Mar 17, 2022 pm 05:43 PM

html5中不支持的标签有：1、acronym，用于定义首字母缩写，可用abbr替代；2、basefont，可利用css样式替代；3、applet，可用object替代；4、dir，定义目录列表，可用ul替代；5、big，定义大号文本等等。

html5废弃了哪个列表标签Jun 01, 2022 pm 06:32 PM

html5废弃了dir列表标签。dir标签被用来定义目录列表，一般和li标签配合使用，在dir标签对中通过li标签来设置列表项，语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir，可使用ul标签取代。

Html5怎么取消td边框May 18, 2022 pm 06:57 PM

3种取消方法：1、给td元素添加“border:none”无边框样式即可，语法“td{border:none}”。2、给td元素添加“border:0”样式，语法“td{border:0;}”，将td边框的宽度设置为0即可。3、给td元素添加“border:transparent”样式，语法“td{border:transparent;}”，将td边框的颜色设置为透明即可。

html5是什么意思Apr 26, 2021 pm 03:02 PM

html5是指超文本标记语言（HTML）的第五次重大修改，即第5代HTML。HTML5是Web中核心语言HTML的规范，用户使用任何手段进行网页浏览时看到的内容原本都是HTML格式的，在浏览器中通过一些技术处理将其转换成为了可识别的信息。HTML5由不同的技术构成，其在互联网中得到了非常广泛的应用，提供更多增强网络应用的标准机。

See all articles

Hot AI Tools

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress images for free

Clothoff.io

AI clothes remover

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)

2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hello Kitty Island Adventure: How To Get Giant Seeds

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

How Long Does It Take To Beat Split Fiction?

4 weeks agoByDDD

R.E.P.O. Save File Location: Where Is It & How to Protect It?

4 weeks agoByDDD

Two Point Museum: All Exhibits And Where To Find Them

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

DVWA

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software